Bivalve mollusks like mussels and oysters are among the most sustainable seafood options, and their welfare status informs ethical consumption decisions.
Bivalve welfare occupies a unique position in animal welfare ethics. The scientific evidence for bivalve sentience is very weak - they lack the centralized nervous system architecture associated with pain experience in vertebrates and even crustaceans. Most welfare scientists do not believe mussels, oysters, scallops, or clams have morally relevant experiences of pain or suffering. This makes bivalve farming a rare case where environmental sustainability and welfare considerations align: bivalve farming has minimal environmental impact, requires no feed, and very likely causes no suffering. For people concerned about both animal welfare and environmental sustainability, bivalves represent one of the most defensible animal-derived foods available. This does not mean we should stop investigating bivalve neuroscience, but the current evidence does not support treating them as welfare subjects.